Adapter structure of ventilating fan

ABSTRACT

An adapter structure of a ventilating fan includes an oval metal adapter and an oval metal shutter provided in the metal adapter having a shape corresponding to the oval metal adapter. A symmetry axis of a longitudinal cross-section of the oval metal shutter in the horizontal direction is a major axis, and a symmetry axis in the vertical direction is a minor axis. The shutter rotates through a rotating shaft in the metal adapter, a curve point is provided between a projection point of a center line of the rotating shaft on the minor axis and a tail of the shutter a curved portion of the shutter is formed by curving the shutter from the curve point to an inner surface side of the shutter along the minor axis. Vibration of the shutter is suppressed in a position where the shutter is opened and turbulent flow is prevented.

This application claims and enjoys the benefit and priority from Chinese Patent Application No. 201320029570.4, filed on Jan. 18, 2013, the disclosure of which is incorporated herein in its entirety by reference.

FIELD OF THE INVENTION

The present application relates to a adapter structure, more particularly, to a adapter structure of a ventilating fan.

DESCRIPTION OF THE RELATED ART

The conventional ventilating fan has shutters for opening or closing the air path of the ventilating fan so as to prevent outside foreign matter into the ventilating fan or outside air into the ventilating fan. FIG. 1 is a schematic view showing a adapter structure of a ventilating fan in the prior art. As shown in FIG. 1, a ventilating fan is disclosed by Japanese Patent Publication No. 2001-33088, the adapter structure 1 of the ventilating fan comprises: a metal adapter 2 having an oval cross section for increasing an air path area and a shutter 3 provided in the metal adapter 2; the metal adapter 2 is divided into two parts: an air inlet 4 and an air outlet 5.

FIGS. 2A and 2B are schematic views showing another adapter structure of a ventilating fan in the prior art. As shown in FIG. 2, a shutter 10 of the ventilating fan is provided to be cooperated with a shape of an oval metal adapter 6, of which a symmetry axis in the horizontal direction is a major axis 7, and a symmetry axis in the vertical direction is a minor axis 8. The metal shutter 10 is constituted by a flat plate 17 and a flange 12 with bending edges, and a rivet 9 is provided at an inner wall of the oval air outlet of the metal adapter 6, for reducing the noise caused by collision between the metal shutter 10 and the metal rivet 9, a rubber ring 11 is provided outside of the rivet 9 and then the shutter 10 is mounted on the rubber ring 11. Otherwise, a limit structure 13 is provided in the adapter 6 for limiting the shutter 10 within a maximum opening position and closing position, and for reducing the noise caused by collision between the metal shutter 10 and the limit structure 13, a sponge 11 is provided in a position where the shutter 10 collides with the limit structure 13.

An oval metal shutter 10 is provided within the metal adapter 6 to be cooperated with the shape of the metal adapter 6, comparing with a round shutter, an imaginary adapter line 20 between the rotatable axis 15 of the oval shutter 10 is more closer to a center of the shutter 10 in the horizontal direction, which is the position of the major axis 7, therefore, the part below the imaginary adapter line 20 between the rotatable axis 15 of the oval shutter 10 is much shorter. As a result, an area for bearing buoyant force of opening the shutter 10 is small. In some circumstances, after the shutter 10 is opened by the air from the ventilating fan, the buoyant force of opening the shutter 10 is not sufficient, and it causes that the shutter 10 is vibrated largely.

Preferably, when the shutter is opened, it is maintained in the horizontal direction. When the ventilating fan operates, the shutter is vibrated, and it is not maintained in the horizontal direction, the air towards the outdoor is blocked by the shutter, therefore the resistance in the air path is increased, under this circumstance, in order to ensure the required air quantity, the load of the fan must be increased.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an adapter structure for suppressing the vibration of the shutter in a position where the shutter is opened and preventing turbulent flow so as to improve the performance of the fan.

In order to achieve an aspect of above objects, the present invention provides a adapter structure of a ventilating fan, the adapter structure comprises: an oval metal adapter and an oval metal shutter provided in the metal adapter and being cooperated with a shape of the oval metal adapter, wherein a symmetry axis of a longitudinal cross-section of the oval metal shutter in the horizontal direction is a major axis, and a symmetry axis in the vertical direction is a minor axis, the shutter is configured to be rotatable through a rotating shaft in the metal adapter, and a curve point is provided between a projection point of a center line of the rotating shaft on the minor axis and a tail of the shutter, a curve portion of the shutter is formed by curving the shutter from the curve point to an inner surface side of the shutter along the minor axis.

The curve point is located on an upstream side where a distance is one third from the rotate shaft to the tail.

A rib is formed on the minor axis of the shutter, and a rib also is formed on a projection of the center line of the rotate shaft on the shutter.

The rotating shaft is formed on two inner sides of the metal adapter integrally, and the shutter is formed by resin of a plate body, two clamp parts are provided for clamping the rotating shaft and erected from left and right edges of the plate body to an outside surface.

Grooves are provided at two inner sides of the metal adapter, and the shutter is formed by resin of a plate body, a protrusion is provided on both sides of the shutter integrally, when the shutter is mounted, the shutter is deformed slightly so that the protrusion is fitted into the grooves to form a rotating shaft.

Reinforcing parts are provided on the clamp parts for reinforcing themselves.

The advantage of the present invention is that the shutter is provided to be light and is opened easily so as to reduce noise and ensure air quantity; and the present invention may reduce the cost, lower the working time and improve quality and reliability of the product. The present invention may suppress the vibration of the shutter in a position where the shutter is opened and prevent turbulent flow so as to improve quality and reliability of the product.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an adapter structure of a ventilating fan in the prior art;

FIGS. 2A and 2B are schematic views of other adapter structure of a ventilating fan in the prior art;

FIG. 3 is an overall schematic view of the assembled ventilating fan according to the embodiment of the present invention;

FIG. 4 is a side view of a shutter according to the embodiment of the present invention;

FIG. 5 is a front view of a shutter according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

FIG. 3 is an overall schematic view of the assembled ventilating fan according to the embodiment of the present invention; FIG. 4 is a side view of a shutter according to the embodiment of the present invention; FIG. 5 is a front view of a shutter according to the embodiment of the present invention.

As shown in figures, an adapter structure 100 of a ventilating fan according to the present invention comprises: an oval metal adapter 200 and an oval metal shutter 300 provided in the metal adapter 200 and being cooperated with a shape of the oval metal adapter 200, the shutter 300 is formed by resin of a plate body, two clamp parts 370 are provided for clamping the rotating shaft 230 and erected from left and right edges of the plate body to an outside surface. The shutter 300 is rotated in the metal adapter 230 by the rotating shafts 230.

The present application gives the following definitions: under the statement of the shutter 300 closing, a surface located at an air inlet 210 side of the metal adapter 200 is defined as an inner surface 320, and a surface located at an air outlet 220 side of the metal adapter 200 is defined as an outer surface 330, parts over the rotating shafts 230 of the shutter 300 is defined as an upper part 340 of the shutter 300, parts under the rotating shafts 230 of the shutter 300 is defined as an lower part 350 of the shutter 300, an end of the lower part 350 of the shutter 300 is defined as a tail 360, a symmetry axis of a longitudinal cross-section of the oval metal shutter 300 in the horizontal direction is defined as a major axis 375, and a symmetry axis in the vertical direction is defined as a minor axis 380.

As the rotating shafts 230 according to the present invention are provided on both sides of the shutter 300, the shafts bodies are not located on the center of the shutter 300, and an imagination line connecting and extending between both sides of the rotating shafts 230 is defined as a center line of the rotating shafts 230. Alternatively in the present invention the rotating shafts 230 may be one shaft running through both sides of the shutter 300. A projection of a center line of the rotating shaft 230 on the shutter 300 intersects the minor axis 380, and the intersection point is defined as a projection point 383, a curve point 382 is provided between the projection point 383 of the center line of the rotating shaft 230 on the minor axis 380 and the tail 360 of the shutter 300, and a curve portion 390 is formed by curving the shutter 300 from the curve point 382 to the inner surface 320 side of the shutter along the minor axis 380.

When the ventilating fan operates, air is flowing from the air inlet 210 of the metal adapter 200 to the shutter 300, and the shutter 300 is opened. Before the air reaches the curve point 382, air density on the lower side of the inner surface 320 of the shutter 300 is equal to the air density on the upper side of the outer surface 330. As the curve portion 390 is formed by curving the shutter 300 from the curve point 382 to the inner surface 320 side of the shutter 300 along the minor axis 380, air density on the lower side of the inner surface 320 of the shutter 300 starts to increase from the curve point 382, and the air density increases as a radian of the curve portion 390 increases, and air density on the upper side of the outer surface 330 of the shutter 300 starts to decrease from the curve point 382, and the air density decreases as a radian of the curve portion 390 increases, so more closer toward the tail 360 of the shutter 300 the position is, more larger the air buoyant is, the shutter 300 is stable by virtue of the curve portion 390 at the opening position and the vibration of the shutter 300 is suppressed.

The shutter 300 is formed smoothly from the curve point 382 to the tail 360 by the curve portion 390, so that the air flowing is guided to flow the outdoor smoothly, and the turbulent is avoided.

In the embodiment, the curve point 382 is located on an upstream side where a distance is a third from the rotate shaft 230 to the tail 360. With the above structure, air density on the lower side of the inner surface 320 of the shutter 300 starts to increase at the upstream side where the distance is one third from the rotating shaft to the tail, so that the air buoyant applied on the inner surface 320 of the shutter 300 is efficient, and the vibration of the shutter 300 at the opening position is suppressed, and the opening degree of the shutter 300 is maintained. Comparing the shutter with curving edges in the prior art, the air flowing in the present invention is more smooth and the air flowing quantity is increased.

The shutter 300 according to the present invention is formed by resin injection molding as a whole. With injection molding, it is not necessary to use the rubber ring for mounting the shutter on the metal adapter, instead, clamp parts 370 are provided vertically on the outer surface 330 of the shutter 300, and the clamp parts 370 and shutter 300 are formed as a whole, clamp holes 371 are provided on the clamp parts 370, a rivet 201 is mounted on the inner wall of the metal adapter 200. When the shutter 300 is mounted, the clamp parts are elastically deformed so that the clamp hole is cooperated with the rivet 201 on the inner wall of the metal adapter 200, and the mount of the shutter 300 is finished. Additionally, reinforcing parts 372 are provided on the clamp parts 370 for reinforcing themselves. Specifically, the reinforcing parts 372 are shaped as a triangle when the shutter 300 is opened horizontally, and are configured to have two reinforcing parts to clamp the rivet 201. Due to the support of the Reinforcing parts 372, the rivet 201 is clamped in the clamp parts 371 so that then the shutter 300 is mounted on the metal adapter 200, the clamp parts 370 is vertical to the upper surface of the shutter 300.

As the shutter 300 is formed by resin injection molding, the noise caused by collision between the metal shutter and the limit structure 400 of the metal adapter 200 is reduced, and the sponge is not necessary. Therefore, the present invention is advantageous in reducing the cost, lowering the working time. Further, as the resin is lighter than metal the shutter 300 is light and opened easily so as to reduce noise and ensure air quantity.

A rib 381 is formed on the minor axis 380 of the shutter 300 according to the present invention, and a rib 231 also is formed on a projection of the center line of the rotate shaft 230 on the shutter 300.

As the shutter 300 is formed by resin injecting molding as a plate body, the shutter is designed to be light and thin. Though the plate body is provided to be thin, as the rib 381 is formed on the minor axis 380, the curve portion 390 is provided on the plate body surely. Though the plate body is provided to be thin, as the rib 231 also is formed on the projection of the center line of the rotate shaft 230 on the shutter 300, the strength of the shutter 300 is efficient for mounting after the shutter is elastically deformed.

Additionally, the rotating shaft 230 of the shutter is provided at the outer surface side of the plate body, even though the shape of the metal adapter 200 is oval, it may increase air flowing quantity in the upper side of the outer surface 330 of the shutter 300 when the shutter 300 is opened. Accordingly it helps to equalize the air flowing quantity in the lower side of the inner surface, and it is easy to maintain the shutter in a status of being opened horizontally.

In the embodiment, the rotating shaft 230 is integrated to be arranged on the metal adapter 200. Alternatively, grooves are provided in two inner sides of the metal adapter 200, and a protrusion is provided on both sides of the shutter 300 integrally. When the shutter 300 is mounted, the shutter 300 is deformed slightly so that the protrusion is fitted into the grooves so as to form a rotating shaft. Those skills in the art may understand that rotating shaft of the present invention can be modified or some technical features are replaceable with equivalents without departing from the spirits of the technical solution of the present invention, which should be considered as falling into the scope of the present invention. 

1. An adapter structure of a ventilating fan, comprising: an oval metal adapter and an oval metal shutter provided in the metal adapter and being cooperated with a shape of the oval metal adapter, wherein a symmetry, axis of a longitudinal cross-section of the oval metal shutter in the horizontal direction is a major axis, and a symmetry axis in the vertical direction is a minor axis, the shutter is configured to be rotatable through a rotating shaft in the metal adapter, wherein: a curve point is provided between a projection point of a center line of the rotating shaft on the minor axis and a tail of the shutter, and a curve portion of the shutter is formed by curving the shutter from the curve point to an inner surface side of the shutter along the minor axis.
 2. The adapter structure according to claim 1, wherein: the curve point is located on an upstream side where a distance is one third from the rotate shaft to the tail.
 3. The adapter structure according to claim 1, wherein: a rib is formed on the minor axis of the shutter, and a rib also is formed on a projection of the center line of the rotate shaft on the shutter.
 4. The adapter structure according to claim 2, wherein: a rib is formed on the minor axis of the shutter, and a rib also is formed on a projection of the center line of the rotate shaft on the shutter.
 5. The adapter structure according to claim 1, wherein: the rotating shaft is formed on two inner sides of the metal adapter integrally, and the shutter is formed by resin of a plate body, two clamp parts are provided for clamping the rotating shaft and erected from left and right edges of the plate body to an outside surface.
 6. The adapter structure according to claim 2, wherein: the rotating shaft is formed on two inner sides of the metal adapter integrally, and the shutter is formed by resin of a plate body, two clamp parts are provided for clamping the rotating shaft and erected from left and right edges of the plate body to an outside surface.
 7. The adapter structure according to claim 1, wherein: grooves are provided in two inner sides of the metal adapter, and the shutter is formed by resin of a plate body, a protrusion is provided on both sides of the shutter integrally, when the shutter is mounted, the shutter is deformed slightly so that the protrusion is fitted into the grooves to form a rotating shaft.
 8. The adapter structure according to claim 2, wherein: grooves are provided in two inner sides of the metal adapter, and the shutter is formed by resin of a plate body, a protrusion is provided on both sides of the shutter integrally, when the shutter is mounted, the shutter is deformed slightly so that the protrusion is fitted into the grooves to form a rotating shaft.
 9. The adapter structure according to claim 5, wherein: Reinforcing parts are provided on the clamp parts for reinforcing themselves.
 10. The adapter structure according to claim 6, wherein: Reinforcing parts are provided on the clamp parts for reinforcing themselves. 